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Start ShoppingCOMETIC C9328F1 Evo Big Twin Cam Service Kit - MLS Head Gaskets for High-Performance Engines
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Description
Upgrade your Evo Big Twin engine's sealing system with Cometic's C9328F1 service kit. Engineered for durability and precision, this comprehensive gasket set ensures optimal performance and longevity for high-output motorcycle engines.
Key Features
- MLS Head Gaskets: Multi-layer steel construction resists compression and heat for long-lasting sealing performance.
- 3.4375in/4.000in/4.060in Bore Compatibility: Precision-engineered for specific engine sizes to ensure perfect fit and function.
- 0.040in Compressed Thickness: Optimized sealing pressure for reliable engine operation under extreme conditions.
- Complete Kit Contents: Includes 2 head gaskets, 2 base gaskets, 4 exhaust gaskets, and a dedicated O-ringing tool.
- Lightweight Design: Only 0.5 lbs for easy handling and storage.
Why Choose This Product
Cometic's Evo Big Twin Cam Service Kit delivers unmatched reliability for performance riders. The MLS materials withstand high temperatures and pressures, while the precise bore sizing ensures compatibility with factory specifications. The included O-ringing tool simplifies installation, reducing the risk of leaks and ensuring a professional-grade seal. Ideal for maintaining peak engine performance in demanding riding conditions.
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Upgrade your Evo Big Twin engine's sealing system with Cometic's C9328F1 service kit. Engineered for durability and precision, this comprehensive gasket set ensures optimal performance and longevity for high-output motorcycle engines.
Key Features
- MLS Head Gaskets: Multi-layer steel construction resists compression and heat for long-lasting sealing performance.
- 3.4375in/4.000in/4.060in Bore Compatibility: Precision-engineered for specific engine sizes to ensure perfect fit and function.
- 0.040in Compressed Thickness: Optimized sealing pressure for reliable engine operation under extreme conditions.
- Complete Kit Contents: Includes 2 head gaskets, 2 base gaskets, 4 exhaust gaskets, and a dedicated O-ringing tool.
- Lightweight Design: Only 0.5 lbs for easy handling and storage.
Why Choose This Product
Cometic's Evo Big Twin Cam Service Kit delivers unmatched reliability for performance riders. The MLS materials withstand high temperatures and pressures, while the precise bore sizing ensures compatibility with factory specifications. The included O-ringing tool simplifies installation, reducing the risk of leaks and ensuring a professional-grade seal. Ideal for maintaining peak engine performance in demanding riding conditions.| SKU | GM766682A8 |
|---|---|
| MPN | C9328F1 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Evo Big Twin | 1986-1999 |
| Harley-Davidson | FX/FXR Series | 1986-1999 |
| Harley-Davidson | Softail (FLST) | 1986-1999 |
Frequently Asked Questions
Supports 3.4375", 4.000", and 4.060" bores. Confirm your piston size before purchase.
Specifically for Evolution Big Twin (1986-1999). Not for Twin Cam.
Kit includes O-ringing tool and gaskets compatible with O-ringing, but not required.
Yes, designed for stock or ported Evo heads in service/gasket replacement.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- torque wrench
- socket set
- feeler gauges
- O-ring installation tool (included)
- engine hoist or stand
Pro Tips
- Follow Harley torque specs exactly (typically 95-105 ft-lbs for heads)
- Use assembly lube on bearings if full service
- Pre-soak gaskets in oil for better seal
Common Mistakes to Avoid
- Incorrect torque sequence on head bolts
- Not cleaning mating surfaces thoroughly
- Wrong bore size selection
Comparison vs Stock/OEM
Cometic MLS gaskets vs. Harley composite/paper stock gaskets
Improvements
- Superior sealing under high pressure/heat
- Multi-layer steel for better durability
- Supports higher compression ratios (up to 11:1+)
Considerations
- Requires precise torque; not direct OEM drop-in for all builds
Durability & Warranty
Expected Lifespan
50,000+ miles with proper torque/install; outlasts OEM 2-3x
Warranty
1 year limited manufacturer warranty against defects
Maintenance
Re-torque heads after 500 miles initial run-in; inspect during valve checks
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